Mean Stress Effect
The mean stress influence reduces the allowable vibration amplitude when a static tensile or compressive prestress is superimposed. It is considered in lifetime calculations by models like Goodman or Smith-Watson-Topper.
Physical-Chemical Mechanism of Action
Mean stress influence describes how a static tensile or compressive preload reduces the permissible vibration amplitude. This means that with constant stress, the maximum allowable alternating stress is decreased.
Metallurgical Relevance & Risks in Welding
Excessive mean stress influence can lead to a deterioration of component life. This can result in cracks, deformation, or catalyst problems over time. In welded joints, this can occur especially when a high static stress exists before welding.
Workshop Practice & Instructions
To minimize mean stress influence, the static preload should be kept as low as possible. In fatigue life calculations, it is important to correctly apply models such as Goodman or Smith-Watson-Topper to determine the permissible vibration amplitude. This helps estimate component life and prevent potential issues.